I know what it is, just curious who all as seen it before. First time for me.
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Suction cup mark
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Yes, see them on new windows or pane that was replaced.
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When I worked at Anderson windows we used cups, suction to pick up the glass, that pattern looks the same
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Yes, first time I’ve seen it between the glass. 
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Strange that its between, that should have been called out at the factory, WARRANTY
House was built in 1987. Pretty much all the windows in the house are shot, failed seals.
Are they Anderson’s
Not sure on brand.
If Anderson’s the should still be under warranty, I guess regardless still a defect
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What’s the warranty time for Anderson’s?
I just texted my Brother, he’s a big shot there, so hold on
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Good luck with Andersen warranty! I had a patio door frame (400 series) fail but I did not find out in time (10 year warranty), it was 12 years old. The inner wooden core rotted because of design defect (the new frame had a redesign). Andersen knew of the design defect and still would not honor the warranty on the frame ($350). That’s how Andersen (shamefully) stands behind their products! So anyone that spews their warranty BS, don’t spew it to me Better hope you notice the problem within their warranty “window” and have all the original receipts or they’ll find something to use as an excuse not to honor it.
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To be honest, I have French wood door that delaminated and they would not help me either, second owner, Simon is correct 10 years unless you know someone, in my case door has been repaired, Thanks to my Brother
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When you know people, you don’t need warranty 
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Something else, they always blame the installers
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I had a brand new windshield once that when the sun hit it right, you could see a full hand print. The auto glass company determined it was on the laminate film between the layers of glass. Apparently they had several windshields returned for the same reason. LOL.
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Don’t get all crazy, I haven’t worked there in 35 years, most windows in my house are Marvin, pisses my brother off
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This house is an '87, been through a few owners. Anderson has a 2 owner limited warranty.
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10 years 20 on the glass,
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